We experienced this one. We did a late ADR at BdP, ate every course, took our time, and rolled out of there at about 11PM. It was a really cool walk out of Epcot - it was empty, the music still played, everything was still lit up.
As we approached the main gate, a cast member asked us where we were heading. "monorail back to GF" I said confidently. He informed us the monorail wasn't running, and directed us to the bus area. Another cast member greated us there, and confirmed where we were going. About 3 minutes later, a bus pulled up, we got on, and it pulled away - clearly the largest limo we'd ever been on!
We talked to the driver on the way back. They will absolutely NOT strand you. They know how many guests are lingering in the park, and they will take you anywhere on the property - to any resort, to another park's parking lot, etc.